PC87383 datasheet(13/77 Pages) NSC

13 / 77 page

1.0 Signal/Pin Connection and Description (Continued)

Revision 1.1

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1.3.8

Strap Configuration

1.3.9

Test and Miscellaneous

Signal

Pin(s)

I/O

Buffer Type

Description

BADDR

INTS

Base Address. Sampled at VDD Power-Up to determine the base

address of the conﬁguration Index-Data register pair.

– No pull-down resistor (default)

- the Index-Data pair at

164Eh-164Fh.

–10K

Ω1 external pull-down resistor - the Index-Data pair at 2Eh-2Fh1.

The external pull-down resistor must be connected to VSS.

1. Because the strap function is multiplexed with the Serial Port pins, a CMOS transceiver device is recommended

for Serial Port functionality; in this case, the value of the external pull-down resistor is 10 K

Ω. If, however, a TTL

transceiver device is used, the value of the external pull-down resistor must be 470

Ω, and since the Serial Port

pins are not able to drive this load, the external pull-down resistor must disconnect tEPLV after VDD power-up

(see Section 7.4.4 on page 70).

TRIS

INTS

TRI-STATE Device. Sampled at VDD Power-Up to force the device to

ﬂoat all its output and I/O pins.

– No pull-down resistor (default)

- normal pin operation

–10K

Ω1 external pull-down resistor - ﬂoating device pins

The external pull-down resistor must be connected to VSS.

When TRIS is set to 0 (by an external pull-down resistor), TEST must be

1 (i.e., left unconnected).

TEST

INTS

XOR Tree Test Mode. Sampled at VDD Power-Up to force the device

pins into a XOR tree conﬁguration.

– No pull-down resistor (default)

- normal device operation

–10K

Ω1 external pull-down resistor - pins conﬁgured as XOR tree.

The external pull-down resistor must be connected to VSS.

When TEST is set to 0 (by an external pull-down resistor), TRIS must be

1 (i.e., left unconnected).

Signal

Pin(s)

I/O

Buffer Type

Description

XOR_OUT

O3/6

XOR Tree Output. All the device pins (except power, ground and Not

Connected pins) are internally connected in a XOR tree structure.

VCORF

On-Chip Core Power Converter Filter. Powers the core logic of all the

device modules. An external 0.1

µF ceramic ﬁlter capacitor must be

connected between this pin and VSS.

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